Can anyone advise me if there are any capacitors in the signal path of it (I understand - so are the ones in the power supply, but for the sake of simplificity of information let us skip on those here...), and if they are, which value and part number, if you have access to this information.
I have modified the Xono phono amp by changing most of the caps in the signal path (and some in the PS) with good results, so I am curious if I can improve on the X1 preamp as well.

As a practical matter we don't want any offset (ever) at the output
of a preamp. Fearless DIYers can get away with that, but I don't
want to have the conversation with the customer in Sri Lanka about
adjusting DC offset.